Dynamometer



w l u Hl. O. HEM

DYNAIVIOMETER Filled Aug. l5 1918 5 Sheets-Sleet l H. O. HEM

DYNAMOMEUPER` Filed Aug. l5

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application tiled augusty la,

To allwL-om itmay/ concern."

Be it lznown that l, l-lALvon U'. llera, a citizen of the United States,residing at 'lloledo, in the. county of lbucas and State of Uhio,.haveinvented certain new and useful improvements in Dynamometers, of whichthe following is a specification.

This invention relates to` idynamometers,l

and more particularly to indicating attach l@ ments to the torqueresisting elements of dynamometers to automatically indicate the forceexerted byan engine, motor or the like to aid in determining the horsepower thereof..

Among the objects of the invention are e provision of an indicatingattachment in dynamometers having' pendulum controlling J'means forcounterbalancing the torque ftransmitted through the torque resisting ilelements of the dynamometer; the connection of such pendulunrcontrolling means to the torque resisting elements so as to permitrotation'of the torque producing elements in either direction; thearrangement of suitable damping means to prevent the transmission ofsudden strains from the torque resisting elements to the indicatingmechanismpand the arrangement of a chart adjacent the indicating hand todirectly translate the force exerted by the engine into horse power.Il

lWith the aboveand other objects in view which will readily appear asthe invention is better understood, my invention consists inthe novelconstruction7 combination and l arrangement of parts to be hereinaftermore fully described and particularly pointed out in the' appendedclaims..

Reference is to be had to the laccompanying drawings illustrating apreferred embodiment of my invention and wherein similar referencenumerals designate similar parts throughout the several views.

lin the drawings Figure l is a, front elevation of a dynamometerembodyin my invention;

Figure 2 is a si e elevation thereof; i Figure 3 is a detail sectiontaken substan tially on the line`3-3 of Figure t;

Figure Ll is an enlarged detail view shown ing the arrangement of thetorque producing element and the pendulum. controlling ttt portion ofthechart; and

rara. senat nu. arance.

Figure t area, or

stantially on the line 6 6 of Figure 5, with portions broken away.

Referring to the drawings, the numeral 5 designates supporting the torquthe shaft 8 of which .a base carryingfstandards 6 for et'resistingelement 7, is .iournalled in suitable bearings 'carried by thestandards. 'llhe torque resisting elem ent herein shown is chosen merelyfor the purpose of exernplitication and comprises a well-known type ofelectric torque resisting member having an armature 9 suitably securedto the shaft 8 and a rotatable tiel be free to rotate about theconformity by lth gine `pled with the magneticl pull e armature in itsrotation. "llhe enmotor or the like to be tested is couto the shaft d inany desire directly rotates the armature.

d l0 somounted as to same shaft in exerted d manner and llhe rotatablefield l0. carriesdiametricallyopposed projecting lugs 1lb which d as atl2, for connection with y anism of the herein shown, tached to th Figure2).

'.lhe indicating attachment as comprising a pair of opp pendulums 13(see Figures l which comprises supporting cured upon transverse shaftsshafts are conne i7, the segments the lower ends .of at'their upper endsupon framework' 19 suitably secu one only of t e indicating a are suiindicating mechanism'.

tably slotted, the leverfmech- As hese lugs is atttachment (see isherein shown o-sitely-disposed and 6) each of segments 14 se- 15 and thetwo cted together by crossbars la being suspended from Hexible ribbons18 secured i i the supporting red within 'tlvhousing 20. intermediatethe supporting segments of l each pendulum ment 2l which is ripherybetween the pillars ing frame and 1s connected a i an equalizer bar 2l.lhe the two pendulums is sub-st also fixed to the shaft 15, said segmentextending at is la larger segtransverse its peof the support` t itsupper end, rib-bon 23 ate face of the ts lower end to construction ofantially identical and the ribbons 23 are connected to opposite sides ofthe equaliser in as by the linlr 25, VFigure t) which i suitableintermediate levers jecting lug 1l on the torque bar 2t, as shown Figure1, which is pivotally connected, with the main lever 26 (see n turn is'connected throughwith the proresisting memis ai detail plan view takensub-` ttl ber, the construction and arrangement being such thatwheneverA the projecting lug 11 is vertically moved a downward pull willbe exerted upon the equalizer bar 24 which is transmitted through theribbons 23 to the larger segments 21, causing the swinging of thependulums so that the pendulum weights thereon'are raised to a positioncounterbalancing the torque transmitted by the pro-k jecting lug 11.During the swinging movement of the pendulums to coun'terbalancethe-torque, thev crossbars 17 are moved verically upward and through themedium of his vertical movement of the cross-bars the /indication on asuitable chart is effected, the

cross-bar 17 carrying a vertically-disposed rack 27 meshing with apinion 28 fixed upon the indicator shaft 29 carrying the indicator hand30. `rllhe indicator Shaft is mounted concentrically of the dial 31having graduations ,in pounds or other suitable weight units inscribedthereon, with which graduations the indicator hand 30 is adapted toco-act in indicating in terms of weight the force exerted vby the engineor motor being tested. This dial 31 is suitably fixed within the housing2O and carries a ch`a`rt 32 inscr-ibed to directly translate into unitsof horse power the force shown by the indicating hand 30 and dial 31. Asshown in Figure 5, this chart may be arranged with concentric rows 'ofindications corresponding to the horse power units exerted at variousrevolutions per minutelof the engine or motor being tested.l The rate ofrevolutions per minute is inscribed on the indicator hand 30 at a pointconcentric with the row of indications marked on 'the chart. g Thecasing 20 is suitably supported upon a casing 33 mounted adjacent thebase. 5 and carries bearings 34 (see-Figurey 4) Asupporting the fulcrumpivots of the main lever 26, which as hereinbefore .mentioned isconnected by the link 25 with the pendulum con.- trolling mechanism.vThe main lever 26 is connected djacent one extremity with 'theplunger35 of al dash damping' means whereby the `transmission of suddenstrains and shocks from the torque resisting elements' isl absorbed,permitting the workingof the indicating mechanism without unduevibration. Intermediate the fulcrum pivot and the connection to Ithelink 25 the main lever 26 is connected with suitable intermediate leversin turn connected with the projectinglug 11 of the torque resistingelement. s herein shown, a link 37 connects |the main lever 26v with theupper shelf lever 38 fulcrumed as at 39 upon bearings carried by thecasing 33 and connected through the link 40 with the lower shelf lever41 fulcrumed upon bearings carried by a bracket 42 adjustably mounted ina crossbar 43 of the casing. 4The lower shelf lever i 41 is connectedwith the projecting lug 1l j `.carries a pivot 54 resting in a bearin Ebar 44 normally rests of the torque resisting element through areversible ltransmission frame whereby a downward pull is exerted on theshelf lever 41 regardless of whether the lug 11 is swung upwardly ordownwardly. This frame preferabl comprises a crossbar 44 suitably securein the slot of the lug 11 and having adjacent one extremity and anupwardly extending knife edge pivot adjacent its opposite extremity (seeFigure 4). The downwardly' extending pivot of' the crossbar 44 normallyrests in a bearing 45 carried by the vertically-disposed link 46 whichat its upper extremity is adjustably connected with a yoke member 47carrying bearings 48 resting on a pivot carried by the shelf lever 41.Adjacent its lower extremity this link 46 arranged to receive a `adownwardly extending knife edge pivot carries a bearing 49 pivot 50 of'the equal-armed lever 51 ful crumed intermediate its ends upon abearing `52 carried at the upper extremity of the link 53'. At its otherextremity the lever 51 55 carried adjacent the lower extremity `o theupright linkl 56, which link also carries adjacent its upper extremity abearing 57 normally resting upon the upwardly-extending knife edge ofthe crossbar 44. The link 53 carries at i-ts lower extremity anapertured plate 58 loosely surrounding the bolt 59 mounted in a lug 60of the casing 33.

Whenever the engine to be tested is so connected with the torqueresisting element that the lug 11 connected with the indicatingattachment is swung downwardly from its normal position, this torque istransmitted to the lower shelf lever` 41 and the indicating attachmentdirectly through the crossbar 44 and the link 46, since thedownwardly-extending knife edge of the crosson the bearing 45 earried bythe link 46. As the crossbar 44 yand link 46 descend, the lever 51 andlinks53 and 56 idly descend, the apertured plate 58 freely falling uponthe bolt 59. When, on

pot 36 or othersuitable the other hand, the' engine to be tested is soconnected with the torque resisting element that the projecting lug 11connected with the indicating attachment is swung upwardly from itsnormal position, the crossbar 44 moves away from the bearing 45 and thelink 46, but in so doing carries upwardly the link 56 through which thearm of the lever 51 connected with the link 56 is elevated and theopposite arm of the lever 51 is swungv downwardly a correspondingdistance (the lever 51 being an equal-armed lever)- This downwardmovement of the arm of the lever `51 connected with the link 46 servesto exert a pull upon the lower shelf lever 41 and the' indicatingattachment corresponding to. the torque transmitted through the lug 11.v

The pendulum controlling means of' the .indicating attachment andincassa its intermediate levers maybe floated through a depending weight6l carried by the main lever 26, substantially as shown in Figure 4l, asuitable link 62 being provided to insure vertical movement ot thisweight.

lf'desired, a graduated beam 63 and slidable poise'. 6a may be mountedon the ymain lll armature of the torque a duced is transmitted fromtachment employing a dial, an indicati lever 26 to increase thecounter-balancing capacity of the indicating attachment.

The operation of my improved dynamometer is believed to beapparent fromthe toregoing description. rllhe engine, motor or the like to be testedis suitably connected with the shaft 8 of the torque resisting elementand when the engine is running the resisting member is rotated. creatinga tendency for the rotatable field to revolve therewith against theresistance odered by the pendulum counterbalancing'mechanism. rlihetorque so prothe rotatable field throughI the projecting lug ll andintermediate levers to the pendulums 13, elevating t'he pendulumsthrough a suiiicient arc to offset the torque produced. The indicatinghand 30 is rotated from the pendulumsrthrough a suitable are to,indicate on the dial 31 thetorce transmitted in terms ot weight units,and this torce in terms of horse power units may alsozbe directly readupon the chart 32.

While it will be apparent that the illustrated embodiment of myinvention herein disclosed is -`well calculated to adequately fulfillthe objects primarily stated, it is to he understood that the inventionis susceptible to variation, modification and change without departingfrom the spirit and scope of the invention as-set forth in the subjcinedclaims.

aving described myinvention, li claim: l. lin a dynalnometer, a torqueresisting element, an indi( ating attachment employing a dial, anindicating hand swinging thereover, a pendulum arranged tocounterbalance the torce exerted by the machine toy be tested, a mainlever connected withthe pendulum, a graduated beam and poise mounted ons'aid lever, and a seriesoit interconnected levers arranged between themain lever andthe torque resisting element.

2.-l[n a dynamometer, an indicating atand swinging thereover, a pendulumarranged 'to counterbalance the force exerted by the machine to betested, a main lever connected with the pendulum, a series of leversconnected with the main lever,`a torque resisting element. and areversing trame mechanism connected with the torque re- Sisting elementand the lower lever of said series to impart a downward pull on saidlower lever regardless ot the direction Vot rotation of the torqueresistingelement.

Vindicating hand swinging 3. ln a dynamometer, the combination of anelectric torque resisting element, a pen tested, a vibration dampingdevice connected to said pendulum and connections trom the pendulum toindicate the amount of Such force. l

a. lin a dynamometer, the combination of an electric torque resistingelement arranged to be connected with the machine to be tested., and ,anindicating attachmentconnected with said element and comprising apendulum counterbalance for the torce exerted by the scale to be tested,and connections t'rom the pendulum to indicate the amount otlsuch torce.v

5 lin a dynamometer, the combination of an electric torque resistingelement arranged to be connected with the machine to be tested, and anindicating attachment connected with said element and comprising a dial,an thereover, a pendulum arranged to counterbalance the force exerted bythe machine to be tested, and connections .trom the pendulum to theindicator hand.

v6., ln a dynamometer, the combination of an. electric torque resistingelement arranged to be connected with the machine toy be tested, and anindicating attachment connected with said element and comprising a dial,an indicating hand swinging thereover, a plurality of pendulums arrangedto counterbalance the force exerted by the machine to be tested, andconnections from the pendulums to the indicator hand.

lin a dynamometer, the combination ot an electric torque resistingelement arranged to be connected with the machine to be tested, and anindicating attachment connected with said element and comprising a dial,an indicating hand swinging thereover, a plurality oi' pendulumsarranged to 'counterba1- ance the torce exerted by the machine to betested, a plurality oty interconnected levers arranged between thependulums and said element, and connections from the pendulums to theindicator hand.

8. lin a dynamometer, the combination of an electric torque resistingelement arranged to be connected with the machine tobe tested, and anindicating attachment connected g `with said element and comprising adial, an

indicating hand swinging thereover, a plurality of pendulums arranged tocounterbalance the force exerted by the machine to be tested, a mainlever connected with the pendulums, a plurality ot interconnected leversarranged between the main lever and said element, and, connections lumsto the indicator hand.

9. lln a dynamometer, the combination ot an electric torque resistingelement arranged to be connected with the machine to be testlltl fromthe pendu l i terbalance,

, arranged between `levers arranged between to show the force exerted bythe main beam and said element, and connections from the pen- 'dulums tothe indicator hand.

10. In a dynamometer, the combination of an electric torque resistingelement, and an indicating attachment be tested and comprising apendulumv counterbalance, connections between said pendulumcounterbalance and said element, and a dash pot secured to saidconnections in position to prevent the transmission of shocks from saidelement to the pendulum counterbalance. i. y

1l. In a-dynamometer, the combination of an electric torque resistingelement, and an indicating attachment connected therewith to show theforce exerted. by the machine'to be tested and comprising a pendulumcouna series of interconnected. levers the pendulum and saideleconnected therewith the machine to' I ment,vand a dash pot connectedwith one of saidl levers and arranged to prevent the transmission V'ofshocks from said element to the pendulum counterbalance.

12.`.In a dynamometer, tachment including a dial andan index (handarranged-to cooperate therewith, said dial bearinga chart having aplurality of concentric rows of graduations', most of said rows showingthe force in terms of weight of the machine being tested and the innerrows showing directly in horse power-the force exerted by said machineat various revolutions per minute, hand bearing indicationsdistinguishing the several rows by the number of revolutions per minuteat which they are computed. .13. Ina dynamometer, an element tending topartake of the motion of a machine to be tested and when sisting `themovement of such machine with a `force proportional .to such restrainingforce, and `a pendulum holding said element against movement.

Y HALVOR O. HEM.

, Witnesses:`-

GEORGE R. FRYE, FRANCES C. DOYLE.

the outer-A the indexl restrained by force, re.

an indicating ath

